Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khat han du snippets" » "khat ha du snippets", "nhat hanh du snippets", "phat hanh du snippets", "khat han dau snippets", "khat van du snippets", "khat han tu snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("khat han du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("khat han du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khat han du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khat han du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.